Jan Trutzschler recently released his "TeaTracks" sequencer for SuperCollider. Here's a screencast of me trying it out for the first time, just demonstrating how you can visually arrange audio files and snippets of SuperCollider code, in a graphical environment that's kind of like a traditional time-based sequencer.
(I forgot to show that you can do some other nice things like "freeze" the generative parts of the piece into audio files, or render the whole track out.)